# Simulation of a enclosure with a spray dryer

Spray dryer is the main operation used to make many products, for example: chemicals, ceramics, foodstuffs, pharmaceuticals, and so on.

One of the major problems for designers and spray dryer operators is the complexity of the process of mixing the spray in the spray chamber.

In this simulation, the gas phase is continuously modeled by the Euler method, and the droplet / particle phase is modeled by a discrete phase model (Lagrange method).

In this analysis, it has been attempted to simulate and analyze the patterns of airflow, humidity and temperature in a spray dryer using the pressure nozzle in the droplet spray in the enclosure using Ansys Fluent software.

### Geometry and mesh

The geometry required for this analysis was generated by Ansys Design Modeler software. The meshing required for this analysis was also generated by Ansys Meshing software. The grid type used in this analysis is unstructured and the total number of cells produced for this geometry is 84047 cells.

### Model

To analyze the drying process in this project, the Species Transport model was used once, and then the DPM model was used. The turbulence viscosity model K-epsilon Standard has been used to analyze the turbulence of the flow generated by the interaction of this flow. The Standard Wall Function is also used near the wall. The energy equation is also activated.

The materials used in this analysis also include oxygen, nitrogen, water vapor and so on. Which is defined in the Material section for this analysis.

### Boundary conditions

The flow inlet for this analysis is defined as Velocity Inlet for the inlet air dryer, and the air temperature is considered to be 195 C. The flow outlet is also considered as pressure outlet for spray driers.

### Discretization of equation

To solve the equations in this analysis, SIMPLE algorithm has been used. Also, the pressure-based solver is used to solve the flow. The First Order Upwind method is used to discretize the equations. It is used only for the discretization of the second order pressure, momentum and energy equations.

At the end, the results are shown as contours of velocity, pressure and temperature contours.

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